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changed "signed" to "SIGNED"
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Thank Tricky.
I done it. The result is ok, But it still has a little error at the biginning, when time is 0 ns. Could you check it for me. thanks
This is error
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# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/adder1/l2/v# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/adder1/l2/v# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/adder1/l2/v# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/mull# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/mull# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).# Time: 0 ns Iteration: 0 Instance: /testbench_step/u/mull
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